Double hook



FIG. 1 is a perspective view of a double hook showing a new design;

FIG. 2 is a front view of the double hook of FIG. 1;

FIG. 3 is a rear view of the double hook of FIG. 1;

FIG. 4 is a side view of the double hook of FIG. 1;

FIG. 5 is a top view of the double hook of FIG. 1; and,

FIG. 6 is a bottom view of the double hook of FIG. 1.

The components of the display shown in broken lines illustrate portions of the double hook that form no part of the claimed design. 

CLAIM What is claimed is the ornamental design for a double hook, as shown and described. 